/*  This file is part of YUView - The YUV player with advanced analytics toolset
 *   <https://github.com/IENT/YUView>
 *   Copyright (C) 2015  Institut f�r Nachrichtentechnik, RWTH Aachen University, GERMANY
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   In addition, as a special exception, the copyright holders give
 *   permission to link the code of portions of this program with the
 *   OpenSSL library under certain conditions as described in each
 *   individual source file, and distribute linked combinations including
 *   the two.
 *
 *   You must obey the GNU General Public License in all respects for all
 *   of the code used other than OpenSSL. If you modify file(s) with this
 *   exception, you may extend this exception to your version of the
 *   file(s), but you are not obligated to do so. If you do not wish to do
 *   so, delete this exception statement from your version. If you delete
 *   this exception statement from all source files in the program, then
 *   also delete it here.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <common/Typedef.h>
#include <parser/common/SubByteReaderLogging.h>

#include <optional>

namespace parser::avc
{

template <size_t N>
static std::optional<bool> read_scaling_list(reader::SubByteReaderLogging &reader,
                                             array<int, N> &               scalingList)
{
  int                 lastScale = 8;
  int                 nextScale = 8;
  std::optional<bool> useDefaultScalingMatrixFlag;
  auto                sizeOfScalingList = scalingList.size();
  for (size_t j = 0; j < sizeOfScalingList; j++)
  {
    if (nextScale != 0)
    {
      auto delta_scale            = reader.readSEV("delta_scale");
      nextScale                   = (lastScale + delta_scale + 256) % 256;
      useDefaultScalingMatrixFlag = (j == 0 && nextScale == 0);
    }
    scalingList[j] = (nextScale == 0) ? lastScale : nextScale;
    lastScale      = scalingList[j];
  }
  return useDefaultScalingMatrixFlag;
}

} // namespace parser::avc